Table 2:

Overall complication rates

OutcomeNo. of StudiesRaw No. of Events in All AneurysmsaMeta-Analysis Percentage (95% CI)I2
Intraoperative rupture1157/13874% (3–6%)0
Vasospasm6182/109113% (5–28%)95
Re-bleeding event1116/10652% (1–4%)0
Aneurysm retreatment1073/7777% (5–12%)60
Morbidity or mortality due to stroke <30 days1021/7713% (2–6%)32
Permanent procedure-related morbidity1153/10776% (4–8%)47
Procedure-related mortality1125/10773% (2–4%)15
  • a Discordances between the raw event percentages and the percentages calculated from the meta-analysis are caused by greater weights assigned to outcomes of studies with larger sample sizes.